Random Graphical Glitches - Clearing Cache Does Nothing

[AgentD]

Hi there,

I've been experiencing some graphical glitches in my game with sprites drawing at complete random. Clearing the cache doesn't change anything. Here's a video to show one example of what I mean:

https://drive.google.com/file/d/0B7Uw15XguKhHdUpoS0VsUDZacFk/view?usp=sharing

Here's the code that governs that textbox, it's a texture drawn over a primitive with an alarm controlling the texture's scrolling. I assumed it had something to do with the UV value of my primitive's texture being larger than 1, but according to the manual, as long as my texture_set_repeat is true, it should work correctly:

scrollx = alarm[1]/60;
scrolly = alarm[1]/60;
texture_set_repeat(true);
if attribute[line, 1] = 1
    {
    //draw shape behind animation
    draw_primitive_begin(pr_trianglestrip)
    draw_vertex(0, 148);
    draw_vertex(0, 340);
    draw_vertex(434, 148);
    draw_vertex(434, 340);
    draw_vertex(542, 148);
    draw_primitive_end();
    //draw animation
    draw_set_alpha(1);
    draw_set_colour(c_white);
    draw_primitive_begin_texture(pr_trianglestrip, sprite_get_texture(dialogueanimation_spr, -1));
    draw_vertex_texture(0, 148, scrollx, 0);
    draw_vertex_texture(0, 340, scrollx, 1);
    draw_vertex_texture(217, 148, scrollx+1, 0);
    draw_vertex_texture(217, 340, scrollx+1, 1);
    draw_primitive_end()
    draw_primitive_begin_texture(pr_trianglestrip, sprite_get_texture(dialogueanimation_spr, -1));
    draw_vertex_texture(217, 148, scrollx, 0);
    draw_vertex_texture(217, 340, scrollx, 1);
    draw_vertex_texture(434, 148, scrollx+1, 0);
    draw_vertex_texture(434, 340, scrollx+1, 1);
    draw_primitive_end()
    draw_primitive_begin_texture(pr_trianglestrip, sprite_get_texture(dialogueanimation_spr, -1));
    draw_vertex_texture(434, 148, scrollx, 0);
    draw_vertex_texture(434, 340, scrollx, 1);
    draw_vertex_texture(542, 148, scrollx+.5, 0);
    draw_primitive_end()
    }

Does anyone have any ideas about what might cause this and how I can fix it?

Thanks!

 

[AgentD]

This issue was solved at this thread: https://www.reddit.com/r/gamemaker/comments/4qdt3v/random_graphical_glitches_clearing_cache_does/

I needed to change the sprite being animated to have dimensions of a power of 2 and set it to be used with 3D.

Thanks!